The balance sheet and income statement shown below are for Koski Inc. Note that the firm has no amortization charges, it does not lease any assets, none of its debt must be retired during the next 5 years, and the notes payable will be rolled over. Balance Sheet (Millions of $) Assets 2019 $4,200 Cash and securities Accounts receivable Inventories Total current assets Net plant and equipment Total assets 17,500 20,300 $42,000 $28,000 $70,000 Liabilities and Equity Accounts payable $27,531 Accruals 12,369 Notes payable 5,000 Total current liabilities $44,900 $9,000 Long-term bonds Total liabilities $53,900 125:52 Long-term bonds $9,000 Total liabilities $53,900 Common stock $3,864 Retained earnings 12,236 Total common equity $16,100 Total liabilities and equity $70,000 Income Statement (Millions of $) 2019 Net sales $112,000 Operating costs except depreciation 104,160 Depreciation Earnings before interest and taxes (EBIT) 2,240 $5,600 840 Less interest Earnings before taxes (EBT) Taxes Net income $4,760 1,190 $3,570 Other data: Shares outstanding (millions) Common dividends (millions of $) Int rate on notes payable & L-T bonds 500.00 $1249.50 6% Earnings before interest and taxes ERAS:35 $5,600 Less interest 840 Earnings before taxes (EBT) Taxes $4,760 1,190 $3,570 Net Income Other data: Shares outstanding (millions) Common dividends (millions of $) 500.00 $1249.50 6% Intrate on notes payable & L-T bonds Federal plus state income tax rate Year-end stock price 25% $68.54 Refer to Exhibit 4.1. What is the firm's ROA? Do not round your intermediate calculations. a. 4.08% Ob. 4.37% c. 4.98% d. 3.67% e. 5.10%